Add crypted keystore sapling add key

src/zcash/Address.cpp

@@ -39,6 +39,12 @@ SproutPaymentAddress SproutSpendingKey::address() const {
 }
 
 //! Sapling
+uint256 SaplingPaymentAddress::GetHash() const {
+    CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
+    ss << *this;
+    return Hash(ss.begin(), ss.end());
+}
+
 SaplingFullViewingKey SaplingExpandedSpendingKey::full_viewing_key() const {
     uint256 ak;
     uint256 nk;

src/zcash/Address.hpp

@@ -111,6 +111,9 @@ public:
         READWRITE(d);
         READWRITE(pk_d);
     }
+    
+    //! Get the 256-bit SHA256d hash of this payment address.
+    uint256 GetHash() const;
 
     friend inline bool operator==(const SaplingPaymentAddress& a, const SaplingPaymentAddress& b) {
         return a.d == b.d && a.pk_d == b.pk_d;